The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 1990
Filed:
Apr. 07, 1989
Applicant:
Inventor:
John L Cordani, Waterbury, CT (US);
Assignee:
MacDermid, Incorporated, Waterbury, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23F / ; C23G / ; C09K / ; C11D / ;
U.S. Cl.
CPC ...
252142 ; 252 791 ; 252 792 ; 252 793 ; 252 794 ; 156656 ; 156666 ;
Abstract
A composition for stripping tin or solder, as well as any underlying copper-tin alloy, from copper surfaces, containing an alkane sulfonic acid, preferably methane sulfonic acid, and an inroganic nitrate, preferably ferric nitrate. The composition effects stripping without any appreciable formation of sludge or precipitate or suspended particles.